decamelize

decamelize.php

<?php

function decamelize($string) {
    $matches = array();
    preg_match("/.*(?=([A-Z].*))/", $string, $matches);
    return $matches;
}

TestDecamelize.php

<?php

require_once 'decamelize.php';

class TestDecamelize extends PHPUnit_Framework_TestCase
{
    public function testOneCamel()
    {
        $rs = decamelize("camelCase");
        $this->assertEquals($rs[0], "camel");
        $this->assertEquals($rs[1], "Case");
    }

    public function testTwoCamel()
    {
        $rs = decamelize("camelCaseAgain");
        $this->assertEquals($rs, array(
            "camelCase",
            "Again"
        ));
    }

    public function testOneThousandCamel()
    {
        $camelString = "camel";

        for ($i = 0; $i < 999; $i++) {
            $camelString .= "Case";     
        }

        $rs = decamelize($camelString . "Case");

        $this->assertEquals(2, count($rs));
        $this->assertEquals($rs, array(
            $camelString,
            "Case"
        ));
    }
}

Cool !!!!!